On Nov 7, 2012, at 7:23 PM, Graham Cox <graham....@bigpond.com> wrote:

> Never mind, Time Machine saved my ass. I must have touched the file somehow 
> (why are these writable?).

Because the headers are located inside the app wrapper instead of 
/System/Library/Frameworks.

I don't know if this issue affects MAS-distributed Xcode installs, since I 
always download and install Xcode from the developer site. I also don't know if 
there's some way the Xcode team could ensure that SDKs are read-only even to 
the user that installed them.

--Kyle Sluder
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